<?php

declare(strict_types=1);

namespace App\Events;

use App\Game\Room;
use Illuminate\Broadcasting\Channel;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcastNow;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Queue\SerializesModels;

final class GameSnapshot implements ShouldBroadcastNow
{
    use Dispatchable;
    use InteractsWithSockets;
    use SerializesModels;

    /**
     * @param  array<string, mixed>  $players
     * @param  array<int, mixed>  $entities
     * @param  array<int, mixed>  $events
     */
    public function __construct(
        public Room $room,
        public array $players,
        public array $entities,
        public array $events,
    ) {}

    public function broadcastOn(): Channel
    {
        return new Channel('game.'.$this->room->id);
    }

    public function broadcastAs(): string
    {
        return 'snapshot';
    }

    /** @return array<string, mixed> */
    public function broadcastWith(): array
    {
        return [
            'state' => $this->room->state,
            'elapsed' => round($this->room->elapsed, 2),
            'seq' => $this->room->seq,
            'players' => $this->players,
            'entities' => $this->entities,
            'events' => $this->events,
            'msgCap' => $this->messageSizeCap(),
        ];
    }

    /**
     * Largest snapshot the WebSocket layer will deliver in one frame; used by
     * the client debug HUD to show broadcast headroom against the Reverb cap.
     */
    private function messageSizeCap(): int
    {
        return (int) config('reverb.apps.apps.0.max_message_size', 20_000);
    }
}